JPH0835572A - Counter-flow check valve - Google Patents

Abstract

PURPOSE:To secure the reliability in use by shifting a valve plate in parallel to the inner peripheral wall in a sealed space, even in case of the arrangement in an inclined state, and by securing the opening/closing operation. CONSTITUTION:Inside a valve body 2 having an inflow passage 7 and an effluence passage 10 on the same axis line, a valve body 4 having a valve plate 16 and a shaft part 17 which is projectingly installed at least on one surface of the valve plate is arranged so that the shaft part 17 is inserted at least into the inflow passage 7 of the valve body 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check valve used for supplying carbon dioxide to aquatic plants arranged in a water tank.

[0002]

2. Description of the Related Art A valve used for supplying oxygen to water in an aquarium or a valve used for supplying carbon dioxide gas to water plants in an aquarium is a backflow prevention valve because of the necessity of preventing backflow of water. It is used.

As a backflow prevention valve used for supplying oxygen to water in an aquarium, it has a valve body having a connection port and a comb valve body arranged in an internal space of the valve body. It is known that the valve body is moved in the internal space by the supply pressure of oxygen to release oxygen from the supply source into water.

As a backflow prevention valve used for supplying carbon dioxide gas to aquatic plants in a water tank, a valve body having connection ports at both ends, and a metal valve body movably arranged in an internal space of the valve body. , An O-ring arranged in the space on the inflow side of the valve body in the inner space, and by moving the valve body away from the O-ring by the carbon dioxide gas pressure supplied from the carbon dioxide gas supply source, the carbon dioxide gas is supplied. It is known to have a structure that releases carbon dioxide gas supplied from a source into water.

[0005]

Since the valve body of the above-mentioned check valve for oxygen supply is made of rubber, the applicable fluid is structurally limited to low pressure gas, and high pressure fluid such as carbon dioxide gas is supplied. It can not be applied as a check valve of the type that does.

The carbon dioxide gas supply valve is of a type in which the valve body moves in the internal space by carbon dioxide gas pressure.
When placed horizontally or vertically, the valve body moves parallel to the inner wall surface of the internal space, and the opening / closing operation of the valve is accurate, so there is no problem, but when placed in an inclined state Since the valve body does not move in parallel with the inner peripheral wall surface of the internal space but tilts, the valve body does not perform an accurate opening / closing operation, which may result in lack of reliability during use.

The present invention has been made in view of the above points, and an object of the present invention is to provide a backflow preventive valve capable of accurately performing opening / closing operations even when arranged in an inclined state and ensuring reliability during use. And

[0008]

The check valve according to the present invention comprises:
A valve body having an inflow passage and an outflow passage on the same axis, and a sealed space located in the middle of these passages, a valve plate, and a shaft portion protruding from at least one surface of the valve plate A valve element arranged in the sealed space so as to be inserted into the passage, an O-ring arranged on the inflow side of the valve plate of the sealed space, and an O-ring arranged on the outflow side of the valve plate of the sealed space. And a spring means that presses it to the side.

In the check valve of the present invention, shaft portions are provided on both sides of the valve plate, and these shaft portions are inserted into the inflow passage and the outflow passage passage of the valve body, and the length of the shaft portion is set when opening and closing the valve. It is also possible to have a length that does not separate from the inflow passage and the outflow passage.

[0010]

In the check valve of the present invention, the shaft portion provided on the valve plate is inserted into the passage communicating with the sealed space of the valve body, and the shaft portion provided on the valve plate is slid through the passage of the valve body. Even when the valve plate is arranged in an inclined state, the valve plate moves in parallel with the inner peripheral wall of the sealed space to surely perform the opening / closing operation, so that reliability in use is secured. Further, the inflow amount and the outflow amount can be adjusted by adjusting the strength of the spring means.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a cross-sectional view of a check valve according to the present invention. The check valve 1 is preferably a check valve body 2 made of a stainless material, a metal valve body 4 arranged in an internal space 3 of the check valve body 2, and an internal check valve body 2. An O-ring 5 arranged on the inflow side of the valve body 4 in the space 3, and a coil spring 6 arranged on the outflow side of the valve body 4 in the internal space 3 of the check valve body 2 for pressing the valve body 4 to the inflow side. It consists of

The check valve body 2 has two valve members 2a and 2b which are integrally joined by fitting each other.
Consists of One of the valve members 2a is formed on a passage 7 extending in the axial direction, a large-diameter space portion 8 connected to the passage 7, a fitting surface 8a formed on the inner surface of the opening end of the large-diameter space portion 8 and an outer surface on the passage 7 side end. It has a connection port 9 and The other valve member 2b is provided so as to protrude from the through passage 10 extending in the axial direction, the fitting portion 11 formed on the outer surface on the one end side, the annular groove 12 formed in the fitting portion 11 and the fitting portion 11. It has a spring seat portion 13 and a connection port 14 formed on the outer surface on the other end side. The two valve members 2a and 2b are the same as the valve member 2
After mounting the O-ring 15 in the annular groove 12 of b, the valve member 2
By fitting the fitting portion 11 of the valve member 2b to the fitting surface 8a formed at the opening end of a, the valve member 2b is integrally joined, thereby forming the internal space 3 in which the large-diameter space portion 8 is sealed. .

The valve body 4 has a valve plate 16 having a diameter slightly smaller than that of the large-diameter space 8 and shafts 17 and 18 projecting from the center of both sides of the valve plate 16, and the valve plate 16 has a large diameter. Located in the space portion 8, one shaft portion 17 is inserted into the passage 7 of the valve member 2a so as to form an annular gap, and the other shaft portion 18 is inserted into the valve member 2b.
It is movably arranged in the large-diameter space portion 8 so as to be inserted into the through passage 10. The lengths of the shaft portions 17 and 18 of the valve body 16 are set so as not to come off the passage 7 and the through passage 10 when the valve is opened and closed. The shaft portion provided on the valve body 16 may be only on the passage 7 side of the valve body 16 if necessary.
An O-ring 8 is arranged in a space defined on the passage 7 side of the valve plate 16 of the large-diameter space portion 8, and the valve plate 1 of the large-diameter space portion 8 is arranged.
A coil spring 6 is arranged in a space defined by 6 on the side of the through passage 10. The coil spring 6 is attached to the spring seat portion 13 of the valve member 2b in a compressed state and presses the valve plate 16 of the valve body 4 toward the O-ring 5 side.

Next, a procedure for assembling the check valve 1 will be described.

As a preparatory step for assembly, an O-ring 15 is first mounted in the annular groove 12 of the valve member 2b. Next,
The O-ring 8 is arranged in the large-diameter space portion 8 of the valve member 2a, and subsequently, the valve body 4 is arranged in the large-diameter space portion 8 so that the shaft portion 17 is inserted into the passage 7. The coil spring 6 is arranged so as to be in contact with the valve plate 16 of No. 4. This coil spring 6
May be attached to the spring seat portion 13 of the valve member 2b. This completes the preparatory stage for assembly.

Next, in order to integrally connect the valve member 2a and the valve member 2b, the valve member 2a and the valve member 2b are connected to each other.
The large-diameter space 8 of a and the spring seat 13 of the valve member 2b are arranged on the same axis so as to face each other, and the valve member 2a and the valve member 2b are arranged.
Are moved toward each other, and the fitting surface 8a of the valve member 2a is moved.
The fitting portion 11 of the valve member 2b is fitted to. With this operation, the shaft portion 18 of the valve body 4 located on the valve member 2a side is inserted into the through passage 10 of the valve member 2b, and the coil spring 6 is seated on the spring seat portion 13 of the valve member 2b. Thus, the valve member 2
By integrally connecting a and the valve member 2b, the valve member 2b
Due to the O-ring 15 arranged in the annular groove 12, the surface between the fitting surface 8a of the valve member 2a and the fitting portion 11 of the valve member 2b is fluid-tight, and fluid does not leak from this portion.

FIG. 2 shows a state in which the check valve 1 according to the present invention is arranged in the middle of a nylon tube 23 connecting the opening / closing valve 21 of the carbon dioxide gas tank 20 and the water tank 22. In FIG. 2, the check valve 1 is arranged in the vertical state, but the check valve 1 operates in the same manner even if it is arranged in the inclined state.

That is, when the check valve 1 is used, the coil spring 6 is seated on the spring seat portion 13 of the valve member 2b in a compressed state and presses the valve plate 16 of the valve body 4 toward the O-ring 5 side. Therefore, the inflow passage is closed between the inflow passage 7 and the large-diameter space 8 unless the valve body 4 moves against the force of the coil spring 6. Since the carbon dioxide gas stored in the carbon dioxide gas tank 20 has a high pressure of about 60 atm, the opening / closing valve 2
The carbon dioxide gas guided to the inflow passage 7 by opening 1 moves the valve body 4 against the force of the coil spring 6, and is discharged into the water tank 22 from the inflow passage 7 through the large-diameter space 8 and the outflow passage 10. To be done. In this case, the shaft portion provided on the valve body 4 is set to a length that does not separate from the inflow passage 7 and the outflow passage 10 when the valve is opened and closed. Open and close accurately. Also, by changing the strength of the coil spring 6, it is possible to adjust the inflow amount and the outflow amount.

FIG. 3 shows an example in which the check valve 1 according to the present invention is arranged in the middle of a nylon tube 23 connecting the air pump 24 and the water tank 22 and is used for supplying oxygen to the water in the water tank.

The check valve body can also be used for other purposes, for example as a draft beer supply valve, by molding it with a transparent plastic material. In this case, the presence or absence of the remaining amount in the tank can be known by visually observing the supply amount to the internal space of the valve.

[0022]

As described above, according to the present invention, the shaft portion provided on the valve plate is inserted into the passage communicating with the sealed space of the valve body, and the shaft portion provided on the valve plate slides along the passage of the valve body. By moving the valve plate, the valve plate moves parallel to the inner peripheral wall of the sealed space even when the valve plate is arranged in an inclined state, and the opening / closing operation is reliably performed, so that reliability in use is ensured. Further, the inflow amount and the outflow amount can be adjusted by adjusting the strength of the spring means.

[Brief description of drawings]

FIG. 1 is a sectional view of a check valve according to the present invention.

FIG. 2 is a view showing an example in which the check valve according to the present invention is used for supplying carbon dioxide gas to a water tank.

FIG. 3 is a view showing an example in which the check valve according to the present invention is used for supplying oxygen to a water tank.

[Explanation of symbols]

 1 Backflow Prevention Valve 2 Backflow Prevention Valve Main Body 2a, 2b Valve Member 3 Internal Space 4 Valve Body 6 Coil Spring 7 Passage 10 Through Passage

Claims (2)

[Claims] 1. A valve body having an inflow passage and an outflow passage on the same axis, and a sealed space located in the middle of these passages,
A valve plate and a valve body having a shaft portion projecting from at least one surface of the valve plate and arranged in the sealed space so that the shaft portion is inserted into the inflow passage of the valve body; and an inflow side of the valve plate in the sealed space. And a spring means arranged on the outflow side of the valve plate of the sealed space to press the valve element toward the O-ring side. 2. The shaft portion of the valve body is formed on both sides of the valve plate, the shaft portion is inserted into the inflow passage and the outflow passage of the valve body, and the length of the shaft portion does not come off from the passage when the valve is opened and closed. The check valve according to claim 1, wherein the check valve has a length.